Chamfering tool



March 8, 1932.

A. P. FALL CHAMFERING TOOL Filed NOV. 4, 1929 gwwzwtoz, WW): FJWZZ,

Patented" Mar. 8, 1932 i I .be used for chamfering and. other similar PATE T f oE-FjlcE v ALBERT -l FALL; or TOLEDO; onio', AssiGNoR To THE wan-EVE IEISTON"flztI lq'g' :(19 131 1.

' rm, or 'roLnno; omo, A conrone'rlon or onro CHAMFERING 'rooL Application filed November 4, 1929., Serial No. 404,533.

Thisinventionrelates to atool adapted to work'on pistons 'or other cylindrical metallic members'having one or more circumferential groovesor channels. I

The general object of; the. invention is to v provideja tool o f'thecharacter stated, which may be easily set'inposition' for working and which may be operated manually for 'per-,

forming' the desired work, while it is guided by a circumferential channel in the member v 1 bearing for the tool as the latter-is turned worked upon. Inits adaptation for work onpistons, thetoolis provided .with room- I paratively thin. bearing shoulders adapted to be insertediin one of the channels and to constitute a three-pointbearing for supporting and guiding. the tool while it t is turned about. the piston. "A' bit suitable for the Ila-r ture of the work to be performed is secured partly in section;

the tool in a planeadjacentto the channel and are formed wlth pro ecting portions 23 inzwhich'the tool is guided. l A number of fitinthe channel. t V The detailedconstruction of theinvention inlits preferredform willbe more fully explained inconnection with the accompanying drawings,;in which 7 'lFigure 1 Iisa side elevation of the tool in operative position, the piston being shown Fig.2 isia'seotion taken on the line 2-2 of Fig. 1.

Fig. 3 isavsection taken on the line 3 3.

of Fig.1;

' Accordingtothe inventiomthe tool, which isshown in connection with'a piston 5, comprises two shanks .6,- pivotally connected at one end, asshow'nfat 7, and normally extendingadjacenteachfother to constitute a han- T dlej jvThe end portions of the shanks .6 remote from the pivot 7 are'lformed with oppositely disposed substantially arcuate jaws 8 V terminatingin bifurcated ears 10 and 11, respectively. A threaded spindle 12 is pivotallyjconnected at 13, to the ear 10, and provided with aunt-.14, which may bescrewed against the ear 11 to draw the the piston '5; t.

. One of the jaws, as8, isformed with an in-.

.wardly' -projecting shoulder 15 and the other bout the piston. A-number, of shims 19 are mounted on the face of. thej aw 8by means of a screw 20 which engages, an elongated. slot 21, so that oneormore of :the shims maybe ad- Jvanced on the face of the shoulder 15 toili-v crease the thickness of the latterto the width of vthe channel 18. 1Shims 22Iare also mounted oni-the corresponding faceof the jaw 9 adapted to be similarly advanioed along the the screws 24 and slots 25. t

The tool, when it is thus set in one of the faces of the shoulders 16 and 17 by means of 1 on one of the jaws, preferably on the sideof I the pistonopposite to the shoulders 16 and 17. This bit is secured in a socket or chuck 27 by means of a set screw 28 and the socket is mounted in a slot 29 formed in the jaw 8 This slot is elongated in a radial direction so thatthe bit maybe fed inwardly by means 35, of a feed screw 30, which has athreaded .con- I nection with the socket 27. vThe jaw 8 is formed with a flange 3lin-which the feed screw 3O isrotatably mounted'andthe latter is provided withasuitable head 32 by means of which it is; rotated. M t As illustrated in the drawings, the tool may be used for chamfering the lower edge of the lowermost channel 18, so as to provide space adjacent the piston ring to catch surplusioil firing chamber. By turning the vtool over and mounting the; same in the: uppermost groove, withthe position of the bit reversed,

the tool may be. used forchamfering the end 100 jaws toward I v ,75 channels 11,,1s adapted to be turned about the H v 195, and prevent the same from workingintothe '5 member of similar shape.

ofthe piston. By a suitable modification of the bit or in the manner in which is it mounted, the tool may be used for other similar operations on a piston or any other metallic shown and described in detail one form in which the invention may be embodied, it is to be understood that this is merely for the purpose of illustration and that the invention includes all such modifications as may fall.

within the scope of the appended claims.

What I claim is: I

1. A tool comprising a handle consisting of'two adjacent shanks pivotally connected at one end'and formed at the other end with opposed jawshaving comparatively thin inwardly projecting shoulders, means for adjusting the jaws so that said shoulders'engage the circumferential channel of a piston to constitute a bearing for the tool, shims mounted on the facesof'the jaws and individually" adjustable into contiguous rela tion tothe facesof said shoulders to add to thethickness thereof so thatthe'y mayha've a close fit; in the channel, and means for mounting a bit in one of the jawsto engage the-"edgeof the channel.

' 'aving 8. A tool comprising two jaws having comparatively thin opposed shouldersinsertible in-the circumferential channel ofa piston so as to engage the bottom thereof andto' constitute a bearing for the'to'ol, shims mounted on the faces of the jaws and individually adjustable adjacent thefaces of said shoulders to add to the thickness thereof so that they may have a close fit between the sides of the channel, a handle connected to said jaws, and means for mounting a bit in .one of the jaws to engage the edge of the channel. 4. A tool comprising two opposed jaws, one having two comparatively thin inwardly projecting spaced shoulders and the other a single similar shoulder, means for adjusting-the jaws to bring said shoulders into close} relation to the circumferential channel of a piston to constitute a threepoint bearing for the tool, shims mounted on the faces of the jaws and individuallyadjust? able adjacent the faces of said shoulders to addto the thickness thereof so that they may have'aclose fit between the sides of the'channel, a handle connected to said jaws, and means for mounting a bit on the jawhaving a single shoulder an'd'in, opposed rclation to the other jaw. I I '5. A tool comprising two shanks arranged \Vhile I have socket: r

normally ad'acent each other to form a handle, said s anks being pivotally connected at one end and formed at the other end with opposed jaws having inwardly projecting shoulders, means for adjusting the jaws so that said shoulders engage the circumferential channel of a piston to constitute a hearing for. the tool, a bit socket mounted for radial adjustment on one of the jaws, and a screw feed operatively connected with said socket.

6. A tool comprising two jaws havin comparatively thin o posed shoulders a apted to be inserted in tlie circumferential channel of a piston and to engage the bottom thereof to constitute a bearing for the tool, means for adjusting said jaws toward or away from each other, a handle connected to said jaws, a bit socket mounted for radial adjustment on one of the jaws, and a screw feed operativelX connected with said socket. j

' 7. tool comprising two opposed jaws, one having two com aratively thin inwardly projecting spaced s oulders and the other aving a single similar shoulder,.means for adjustingthe jaws to bring said shoulders into close relation to the circumferential channel of a piston to constitute a threepoint bearing for the tool, a handle connected [to said jaws, a bit socket'mountedfor radial adjustment on'the jawhaving a single shoulder and in opposed relation to the other j aw, and a screw feed operatively connected with said socket.

8. A tool comprising a handle consisting of two normally adjacent shanks pivotally connectedat'one end and formed It the other end'with opposai jaws having'comparatively thin inwardly projecting shoulders, means for adjusting the jaws so that said shoulders engage the circumferential channel of a pinton to constitute a bearing for the tool, shims mounted on the faces of the jaws and individually adjustable into position adjacent the faces of said shoulders to addto the thickness thereof so that they may have a close fit between the sides of the channel, a. bit socket mounted for radial adjustment on one of the jaws, and a screw feed operatively connected to said socket.

9. A tool comprising two j awshavin comparatively thin opposed shoulders a apted to'be inserted in the circumferential channel of a piston and to engage the bottom thereof to constitute a bearing ,for'the tool, shims mounted on the faces of the jaws and individually adjustable adjacent the faces of said shouldersto add to the thickness thereof so that they may fit closelybetween the sides of the channeLa-bit socket mounted for radial adjustment on one of thejaws, and a screw feed operatively connected with said i 10. A tool comprising two jaws, one havingitwo comparativelythin inward having a single similar" shoulder, means for ly projecting spaced shoulders and the other adjusting the jaws to bring said shoulders into contact with the bottom of a circumfe'r I ential channel of a piston to constitute a three-point bearing for the tool, shims I mounted onthe facesof' the jaws and individually adjustable adjacent thefaces of said shoulders to add to the thickness thereof so that they may fit closely between the sides of v 7 channel, a bit socket radially adjustable on the jaw having a single shoulder and in v0pposed'relation to the other jaw, and a screw feed operatively connected to said socket.

11. A tool comprising two shanks" pivotally connected at one end-and normally dis posed adjacent each other to form a handle, a pair of substantially arcuate jaws connected with the handle at the end oppositethe pivotal. connection and arranged tospana piston,'sai'd jaws being .formed so as to engagea circumferential channel inthe piston,

ears on the free ends of said jaws, means c0-,

operating with said ears to draw the jaws toward each'other into, close relation to the channel, and means for mounting a bit on one signed my name to this specification.v ALBERT P. FALL.

of the j aws.

12. A tool comprising two shanks, pivotally connected at one end and normally dis .posed adjacent each? other to forma handle,;

a pair'of substantially arcuate jaws connect, 1 t ed withthe handle at the end opposite the pivj I otal connection and arrangedoito span a piS- ton, said jaws being formed'so, as to have 'a three-point engagement with the bottom of a I circumferential channel inthe piston, shims cooperating with the bearing points and selectively adjustable to addto the thickness thereof so that they may have a close fit with the sides of the channel, ears on the free ends of said jaws, means cooperating with said ears to draw the jaws toward each other into close relation to the channel, and means'for mounting a bit on one of the jaws. I

In testimony whereof I have hereunto 

